参照修改:
var form = this.options.form;
var value = this.getValue();
if(value == "twoweek"){
form.invisible(["L年月1","L年月2","month1","month2","L开始日期","L结束日期","start_date","end_date"]);
form.visible(["L上双周开始日期","L上双周结束日期","L本双周开始日期","L本双周结束日期","start_date_sz","end_date_sz","start_date_bz","end_date_bz"]);
}